add ansible template comment to template files

roles/unbound/templates/unbound.conf.j2

+#
+# {{ ansible_managed }}
+#
+
 server:               
 	use-syslog: yes     
 	username: "unbound" 

roles/zabbix-server/templates/nginx.d.conf.j2

+#
+# {{ ansible_managed }}
+#
+
 upstream zabbix {
     server unix:///run/php-fpm/zabbix-web.socket;
 }